I use 1" most all the time but once in a while 1.5s. 1s do fine for me because I pin quad, delt and glute in rotation. No need ever to go past 1.5s. Not for me anyway. One thing for sure though... I leave the pin in for at least 30 seconds after a 2 or 2.5 cc push. No gains running down the skin for me.
